Civil engineering lifting device

Abstract

The utility model relates to civil engineering construction equipment technical field, specifically disclose a civil engineering lifting device, it includes base, lifting mechanism and fine adjustment mechanism. Lifting mechanism is equipped with lifting platform, drive arrangement and positioning assembly, and positioning assembly includes main positioning frame and vice positioning frame, and vice positioning frame is equipped with T type adjusting groove and is through connecting bolt movable installation, fine adjustment mechanism includes fine adjustment device, position monitoring device and feedback adjusting device, and fine adjustment device realizes displacement adjustment through the cooperation of adjusting screw and drive mechanism, and position monitoring device integrates laser range finding sensor and position encoder, and feedback adjusting device forms closed loop control. The utility model can realize the continuous accurate positioning adjustment of lifting platform under the non-standard floor height.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering construction equipment technology, specifically a civil engineering lifting device. Background Technology

[0002] In civil engineering, lifting devices are key equipment for the vertical transportation of materials or personnel, and are widely used in building construction, bridge construction, underground engineering, and other scenarios. These devices typically consist of a power system, transmission mechanism, load-bearing platform, and guide rail system. The platform is raised and lowered via a motor-driven rack and pinion or wire rope winch. In actual operation, lifting devices must possess good stability, controllability, and safety to adapt to the needs of different working conditions.

[0003] With the increasing complexity of construction environments, higher requirements are placed on the position adjustment accuracy of lifting devices during operation. In existing technologies, most lifting devices use fixed-interval limit blocks or limit switches for height positioning control, and their adjustment relies on the preset installation position of mechanical components. However, when dealing with non-standard floor heights or requiring frequent fine-tuning of the stopping position, the adjustment flexibility of this type of structure is limited, making it difficult to achieve continuous, small-range position corrections. This results in room for further improvement in stopping accuracy. Therefore, we propose a civil engineering lifting device. Utility Model Content

[0004] The purpose of this utility model is to provide a civil engineering lifting device to solve the problem mentioned in the background art. However, when dealing with non-standard floor heights or when frequent fine-tuning of the stopping position is required, the adjustment flexibility of this type of structure is limited, making it difficult to achieve continuous, small-range position correction, resulting in room for further improvement in stopping accuracy.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a civil engineering lifting device, comprising a base, a lifting mechanism, and a fine adjustment mechanism.

[0006] The lifting mechanism includes a lifting platform, a drive unit, a guide rail system, and a positioning component. The lifting platform is located above the base and is slidably connected to the guide rail system. The drive unit is fixedly installed inside the base and its output end is connected to the lifting platform to drive the lifting platform to move along the guide rail system. The positioning component includes a main positioning frame and a secondary positioning frame. The main positioning frame is fixedly connected to the bottom of the lifting platform and extends along the length of the guide rail system. The secondary positioning frame is fixedly connected to the side wall of the base and is located adjacent to the main positioning frame. An adjustment groove is provided inside the secondary positioning frame, and a position adjustment mechanism is provided in the adjustment groove to achieve precise adjustment of the position of the secondary positioning frame.

[0007] The fine-tuning mechanism is located inside the base and includes a fine-tuning device, a position monitoring device, and a feedback adjustment device. The fine-tuning device includes an adjusting screw, an adjusting nut, and a drive mechanism. The adjusting screw is rotatably connected to the side wall of the secondary positioning frame. The adjusting nut is sleeved on the outside of the adjusting screw and fixedly connected to the secondary positioning frame. The drive mechanism is fixedly installed inside the base and its output end is connected to the adjusting screw to drive the adjusting screw to rotate. The position monitoring device is located on the side wall of the lifting platform and includes a laser range sensor and a position encoder. The laser range sensor is used to detect the straight-line distance between the lifting platform and the target position, and the position encoder is used to detect the actual displacement of the lifting platform. The feedback adjustment device is fixedly installed inside the base and its input end is connected to the position monitoring device, and its output end is connected to the drive mechanism to form a closed-loop control.

[0008] The adjustment slot is designed as a T-shaped slot structure, which includes a main slot and a branch slot. The main slot is opened along the length of the auxiliary positioning frame, and the branch slot is connected to the main slot at a vertical angle. The auxiliary positioning frame is movably connected to the adjustment slot by connecting bolts. The head of the connecting bolt is located inside the main slot, and the screw part of the connecting bolt extends through the main slot and the branch slot to the outside of the auxiliary positioning frame.

[0009] The fine-tuning device also includes a limiting mechanism and a locking mechanism. The limiting mechanism includes a first limiting block and a second limiting block. The first limiting block is fixedly connected to the left end of the adjusting screw, and the second limiting block is fixedly connected to the right end of the adjusting screw. The locking mechanism includes a locking nut and a compression spring. The locking nut is threaded to the outside of the adjusting screw, and the compression spring is located between the adjusting nut and the locking nut and applies continuous pressure to the adjusting nut.

[0010] The drive mechanism includes a small geared motor, a transmission gear, and a drive shaft. The small geared motor is fixedly installed inside the base and its output shaft is meshed with the transmission gear. One end of the drive shaft is fixedly connected to the transmission gear, and the other end is coaxially connected to the adjusting screw. The control end of the small geared motor is connected to the feedback adjustment device to achieve precise speed control.

[0011] The position monitoring device also includes a buffer protection device and a calibration mechanism. The buffer protection device includes a buffer pad and a damper. The buffer pad is fixedly connected to the bottom edge of the lifting platform, and the damper is set at the contact part between the lifting platform and the guide rail system to reduce the impact of vibration. The calibration mechanism includes a reference calibration block and an adjustment scale. The reference calibration block is fixedly connected to the top of the base, and the adjustment scale is set on the side wall of the lifting platform and used in conjunction with the reference calibration block.

[0012] The feedback adjustment device includes a signal processor, a comparator, and a control unit. The input of the signal processor is connected to the laser rangefinder and the position encoder. The comparator is used to compare the target position signal with the actual position signal and output a deviation signal. The control unit calculates the adjustment command based on the deviation signal and outputs it to the drive mechanism. The control unit has an adaptive adjustment algorithm built in to improve the adjustment accuracy and response speed.

[0013] The base also includes a backup positioning mechanism and a safety protection system. The backup positioning mechanism includes multiple backup positioning pins and positioning holes. The positioning holes are located on the side wall of the secondary positioning frame and are arranged at equal intervals. The backup positioning pins can be inserted into the positioning holes to provide additional positioning support. The safety protection system includes an overload protection device, an emergency stop device, and a fault alarm device. The overload protection device is used to monitor the working load of the drive device. The emergency stop device is located on the lifting device operation panel. The fault alarm device includes an audible and visual alarm and is connected to the control unit.

[0014] The guide rail system includes a main guide rail and an auxiliary guide rail. The main guide rail is fixedly connected to both sides of the base and is arranged in parallel. The auxiliary guide rail is arranged between the main guide rails and forms a stable triangular structure with the main guide rails. The top and bottom of the auxiliary guide rail are provided with lubrication grooves, which are filled with solid lubricant to reduce friction.

[0015] The lifting platform is fixedly connected to a load-bearing frame and a counterweight device at its bottom. The load-bearing frame is made of welded steel structure and is fixedly connected to the bottom of the lifting platform. The counterweight device includes a counterweight block and a counterweight block guide rail. The counterweight block is set inside the counterweight block guide rail and can slide up and down. The counterweight block guide rail is fixedly connected to the inner side wall of the base. The weight of the counterweight block is configured according to the load requirements of the lifting platform to maintain the system balance.

[0016] The base is equipped with adjustable feet and a level indicator. The adjustable feet include four adjusting bolts and a support base. The support base is fixedly connected to the four corners of the base bottom. The adjusting bolts are threaded into the support base and can be rotated to adjust the height. The level indicator includes a level and an adjusting dial. The level is fixedly connected to the top of the lifting platform. The adjusting dial is set on the side wall of the base and corresponds to the adjusting bolts.

[0017] This utility model has at least the following beneficial effects:

[0018] This civil engineering lifting device, through its fine-tuning mechanism, particularly the coordination between the micro-adjustment device and the position monitoring device, enables continuous and precise adjustment of the lifting platform's position, solving the problem of traditional lifting devices' difficulty in making small-range position corrections. The laser rangefinder in the position monitoring device can detect the precise distance between the lifting platform and the target position in real time, while the position encoder accurately records the actual displacement of the lifting platform. Together, these provide accurate position data for the feedback adjustment device. The feedback adjustment device, through its built-in adaptive adjustment algorithm, can automatically adjust the operating parameters of the micro-adjustment device based on actual deviations, achieving closed-loop precise control.

[0019] The design of the auxiliary positioning frame and the adjustment groove gives the entire positioning system excellent adjustment flexibility. The T-slot structure not only provides the auxiliary positioning frame with adjustment capability in the main direction, but the branch grooves also provide additional freedom for fine-tuning the auxiliary positioning frame. The detachable connection of the connecting bolts facilitates maintenance and adjustment, while the limit and locking mechanisms ensure stability and safety after adjustment.

[0020] The drive mechanism employs a small geared motor paired with transmission gears, ensuring sufficient driving force while achieving precise speed control. The inclusion of a buffer protection device and a calibration mechanism effectively reduces the impact of external factors on positional accuracy, improving system reliability and measurement accuracy.

[0021] The inclusion of backup positioning mechanisms and safety protection systems further enhances the practicality and safety of the device. Multiple backup positioning pins ensure accurate positioning under special working conditions, while overload protection, emergency stop, and fault alarm devices ensure operational safety.

[0022] The structural design of this device fully considers the complex environmental requirements of civil engineering sites. The triangular stable structure of the guide rail system, the steel structure design of the load-bearing frame, and the adjustability of the adjustable feet enable the lifting device to adapt to different working conditions and installation environments, significantly improving the adaptability and precision control capability of the lifting device in civil engineering applications. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the left-side front view of the present invention;

[0024] Figure 2 This is a schematic diagram of the right-side front view of the present invention.

[0025] Figure 3 This is a schematic diagram of the rear structure of the present invention viewed from the left.

[0026] Figure 4 This is a schematic diagram of the rear right view of the present invention.

[0027] Figure 5 This is a schematic diagram of the structure of this utility model from a frontal, bottom-view perspective;

[0028] Figure 6 This utility model Figure 3 Enlarged structural diagram at point A in the diagram;

[0029] Figure 7 This utility model Figure 5 A schematic diagram of structure B in the diagram.

[0030] In the diagram: 1. Base; 2. Lifting platform; 3. Drive unit; 4. Guide rail system; 5. Main positioning frame; 6. Secondary positioning frame; 7. Adjustment groove; 8. Adjustment screw; 9. Adjustment nut; 10. Connecting bolt. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Example 1

[0033] Please see Figures 1 to 7 This utility model provides a technical solution: a civil engineering lifting device, including a base 1, a lifting platform 2, a drive device 3, a guide rail system 4, and a positioning component and a fine-tuning mechanism disposed between the lifting platform 2 and the base 1. The base 1 serves as the supporting foundation for the entire device, stably set on the working ground. The lifting platform 2 is located above the base 1, its structure being a flat bearing surface, and its bottom is slidably connected to the guide rail system 4. The drive device 3 is installed inside the base 1, its power output end being mechanically connected to the lifting platform 2, driving the lifting platform 2 to reciprocate up and down along the extension direction of the guide rail system 4. The positioning component includes a main positioning frame 5 fixedly connected to the bottom of the lifting platform 2 and a secondary positioning frame 6 fixedly connected to the side wall of the base 1. The fine-tuning mechanism is also disposed inside the base 1, working in conjunction with the positioning component to perform precise adjustments to the stopping position of the lifting platform 2.

[0034] In the above embodiment, as a preferred embodiment, the guide rail system 4 includes two parallel main guide rails and an auxiliary guide rail disposed between the two main guide rails. The lower ends of both the main guide rails and the auxiliary guide rail are fixedly connected to both sides of the base 1, while the upper ends are fixed via a connecting structure, together forming a stable triangular guide structure. The side of the lifting platform 2 is provided with sliders that match the main guide rails and the auxiliary guide rail, with the inner wall of the sliders sliding in contact with the outer surface of the guide rails. This structural distribution enhances the lateral stability of the lifting platform 2 during lifting. Furthermore, lubrication grooves are provided on the top and bottom surfaces of the auxiliary guide rail, pre-filled with solid lubricant. When the lifting platform 2 moves, the sliders contact the lubrication grooves, and the solid lubricant continuously lubricates the contact surfaces, reducing frictional resistance.

[0035] In the above embodiments, as a preferred option, a load-bearing frame and a counterweight device are also fixedly connected to the bottom of the lifting platform 2. The load-bearing frame is a reinforced structure formed by welding multiple steel sections into a grid or truss shape, which is directly fixedly connected to the bottom surface of the lifting platform 2. The load-bearing frame improves the overall load-bearing strength and resistance to bending deformation of the lifting platform 2. The counterweight device includes a counterweight block and a counterweight block guide rail. The counterweight block guide rail is vertically fixedly installed on the inner side wall of the base 1, and the counterweight block is housed inside the counterweight block guide rail and can slide up and down along its length. The counterweight block is connected to the load-bearing frame of the lifting platform 2 via a cable or chain that passes over a pulley system located at the top of the device. The weight of the counterweight block is configured according to the design load of the lifting platform 2 to balance the weight of the lifting platform 2 and part of its load.

[0036] In the above embodiment, as a preferred embodiment, the main positioning frame 5 of the positioning assembly is a plate-like structure extending along the length of the guide rail system 4, with its upper end fixedly connected to the bottom of the lifting platform 2. The secondary positioning frame 6 is also a plate-like structure, fixedly connected to the side wall of the base 1 by connecting bolts 10, and its position is adjacent to the main positioning frame 5. An adjustment groove 7 is provided inside the secondary positioning frame 6 along its length. In this embodiment, the cross-sectional structure of the adjustment groove 7 is a T-shaped groove structure, which includes a wider main groove and a narrower branch groove that is perpendicularly connected to the main groove. The head of the connecting bolt 10 is accommodated inside the main groove, while its screw portion passes through the through holes of the branch groove and the side wall of the base 1 in sequence, and is locked by a nut. This structure allows the secondary positioning frame 6 to be adjusted in position along the length of the adjustment groove 7 after the connecting bolts 10 are loosened.

[0037] In the above embodiment, as a preferred embodiment, the fine-tuning mechanism includes a fine-tuning device, a position monitoring device, and a feedback adjustment device disposed inside the base 1. The core components of the fine-tuning device include an adjusting screw 8 and an adjusting nut 9. The two ends of the adjusting screw 8 are rotatably connected to the support wall inside the base 1 via bearings. The outside of the adjusting nut 9 is fixedly connected to the side wall of the sub-positioning frame 6, and its internal thread meshes with the external thread of the adjusting screw 8. One end of the adjusting screw 8 is connected to a drive mechanism, which includes a small geared motor, a transmission gear, and a drive shaft. The output shaft of the small geared motor meshes with the transmission gear, one end of the drive shaft is fixedly connected to the transmission gear, and the other end is coaxially fixedly connected to the adjusting screw 8. When the small geared motor rotates, it drives the adjusting screw 8 to rotate through the transmission gear and the drive shaft, thereby driving the adjusting nut 9, which meshes with it, to produce axial displacement. This displacement causes the sub-positioning frame 6, which is fixed to it, to move a small distance.

[0038] In the above embodiments, as a preferred embodiment, the fine-tuning device further includes a limiting mechanism and a locking mechanism. The limiting mechanism includes a first limiting block and a second limiting block. The first limiting block is fixedly connected to one end of the adjusting screw 8 near the drive mechanism, and the second limiting block is fixedly connected to the other end of the adjusting screw 8. The two limiting blocks define the maximum travel range of the adjusting nut 9 on the adjusting screw 8. The locking mechanism includes a locking nut and a compression spring. The locking nut is threaded onto the outside of the adjusting screw 8 and located on one side of the adjusting nut 9. The compression spring is sleeved on the adjusting screw 8 and compressed between the adjusting nut 9 and the locking nut. The compression spring applies a continuous axial pressure to the adjusting nut 9, increasing the friction between the threaded pair of the adjusting nut 9 and the adjusting screw 8. After the fine-tuning action is completed, this pressure helps maintain the stability of the sub-positioning bracket 6.

[0039] Example 2

[0040] like Figures 1 to 7 In this second embodiment, the other structures remain unchanged, but the difference from the first embodiment is:

[0041] In the above embodiment, as a preferred embodiment, the position monitoring device is disposed on the side wall of the lifting platform 2, and includes a laser rangefinder and a position encoder. The main body of the laser rangefinder is fixed on the lifting platform 2, and its emitted beam is aligned with a preset target position or reference object to detect the straight-line distance data between the lifting platform 2 and the target position in real time. The position encoder is linked with the output shaft of the drive device 3 or the guide rail system 4 to detect the actual vertical displacement of the lifting platform 2 in real time. The position monitoring device also includes a buffer protection device and a calibration mechanism. The buffer protection device includes a buffer pad fixed to the bottom edge of the lifting platform 2 and a damper disposed at the contact part between the lifting platform 2 and the guide rail system 4. The calibration mechanism includes a reference calibration block fixedly connected to the top of the base 1 and an adjustment scale disposed on the side wall of the lifting platform 2 and engraved with graduations, and the two work together to perform initial position calibration.

[0042] In the above embodiment, as a preferred embodiment, the main body of the feedback adjustment device is fixedly installed in an electrical box inside the base 1, and includes a signal processor, a comparator, and a control unit. The input terminal of the signal processor is electrically connected to the signal output terminals of the laser rangefinder and the position encoder, respectively, to process and convert the received distance and displacement signals. The input terminal of the comparator is connected to the signal processor to compare the processed target position signal with the actual position signal, and outputs a deviation signal representing the difference between the two. The input terminal of the control unit receives this deviation signal, and its internal adaptive adjustment algorithm calculates the corresponding adjustment command based on the magnitude and direction of the deviation signal, and outputs the command to the control terminal of the small geared motor in the fine-tuning device to provide precise command output for its speed and direction.

[0043] In the above embodiments, as a preferred embodiment, the base 1 is further provided with a backup positioning mechanism and a safety protection system. The backup positioning mechanism includes multiple backup positioning pins and multiple positioning holes evenly spaced on the side wall of the secondary positioning frame 6. In situations requiring prolonged fixation or bearing significant impact loads, the backup positioning pins can be manually inserted into the corresponding positioning holes on the secondary positioning frame 6 and the base 1 to provide additional mechanical positioning support. The safety protection system includes an overload protection device, an emergency stop device, and a fault alarm device. The overload protection device monitors the operating current of the drive unit 3 and cuts off the power supply when the current exceeds a preset threshold. The emergency stop device is a red physical button located on the external operation panel of the device. The fault alarm device includes an audible and visual alarm connected to the control unit, which issues an audible and visual alarm when a system abnormality is detected.

[0044] In the above embodiment, as a preferred embodiment, the bottom of the base 1 is provided with adjustable feet and a leveling device. A support base is fixedly connected to each of the four corners of the bottom of the base 1, and an adjusting bolt is threaded into the interior of each support base. The lower end of the adjusting bolt contacts the ground; by rotating the adjusting bolt, the height of the four corners of the base 1 can be changed. The leveling device includes a level, which is fixedly installed on the top surface of the lifting platform 2 or the top of the base 1. During equipment installation, the operator can observe the position of the bubble on the level and simultaneously rotate the four adjusting bolts until the bubble is centered, thus completing the leveling adjustment of the entire device.

[0045] Example 3

[0046] like Figures 1 to 7 In this second embodiment, the other structures remain unchanged, but the difference from the first embodiment is:

[0047] In this invention, the working steps of the device are as follows:

[0048] 1. The operator starts the drive unit 3, which drives the lifting platform 2 to move up or down along the guide rail system 4 via its transmission mechanism, approaching the preset target floor or working height. During this process, the position encoder records the displacement of the lifting platform 2 in real time. When the lifting platform 2 reaches the vicinity of the target position, the drive unit 3 decelerates and stops.

[0049] Second, at this point, the laser rangefinder sensor installed on the lifting platform 2 begins to operate, measuring the precise distance between itself and the target position reference point, and transmitting this distance data to the feedback adjustment device. The signal processor and comparator in the feedback adjustment device compare the actual position measured by the sensor with the preset target position and calculate the position deviation value.

[0050] Third, the control unit sends a command to the small geared motor in the fine-tuning device based on the calculated position deviation value. The small geared motor rotates precisely by a specific angle according to the command, driving the adjusting screw 8 to rotate through the transmission gears and drive shaft.

[0051] Fourth, the rotation of the adjusting screw 8 drives the adjusting nut 9, which meshes with it, to produce a precise linear displacement. Since the adjusting nut 9 is fixedly connected to the secondary positioning frame 6, the secondary positioning frame 6 also moves a small distance. The change in the position of the secondary positioning frame 6 changes the reference of the entire positioning assembly, thereby precisely adjusting the final stopping position of the lifting platform 2.

[0052] Fifth, the above second to fourth steps form a closed loop process. The feedback adjustment device continuously monitors the position deviation and outputs adjustment commands until the position deviation detected by the laser rangefinder is less than the preset accuracy threshold. At this time, the control unit stops outputting commands to the small reduction motor, the fine adjustment process is completed, and the lifting platform 2 is accurately stopped at the target position.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0054] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A civil engineering lifting device, characterized in that: include: Base, lifting mechanism, and fine-tuning mechanism; It also includes: a lifting mechanism, which includes a lifting platform disposed above the base, a driving device for driving the lifting platform to move, a guide rail system connecting the lifting platform and the base, and a positioning component; the positioning component includes a main positioning frame fixedly connected to the bottom of the lifting platform and a secondary positioning frame fixedly connected to the side wall of the base, and the secondary positioning frame has an adjustment groove inside; A fine-tuning mechanism is provided inside the base. The fine-tuning mechanism includes a fine-tuning device, a position monitoring device, and a feedback adjustment device. The fine-tuning device includes an adjusting screw rotatably connected to the base, an adjusting nut sleeved on the outside of the adjusting screw and fixedly connected to the secondary positioning frame, and a driving mechanism. The output end of the driving mechanism is connected to the adjusting screw. A position monitoring device is installed on the side wall of the lifting platform; A feedback adjustment device is provided, wherein the input end of the feedback adjustment device is connected to the position monitoring device, and the output end of the feedback adjustment device is connected to the drive mechanism of the fine-tuning device.

2. The civil engineering lifting device according to claim 1, characterized in that: The drive mechanism of the fine-tuning device includes a small geared motor, a transmission gear, and a drive shaft. The output shaft of the small geared motor is meshed with the transmission gear. One end of the drive shaft is fixedly connected to the transmission gear, and the other end of the drive shaft is coaxially connected to the adjusting screw.

3. The civil engineering lifting device according to claim 1, characterized in that: The adjusting groove is a T-shaped groove structure, which includes a main groove and a branch groove. The auxiliary positioning frame is movably connected to the adjusting groove by connecting bolts. The head of the connecting bolt is located inside the main groove, and the threaded part of the connecting bolt passes through the branch groove.

4. The civil engineering lifting device according to claim 1, characterized in that: The position monitoring device includes a laser rangefinder for detecting the straight-line distance between the lifting platform and the target position, and a position encoder for detecting the actual displacement of the lifting platform.

5. The civil engineering lifting device according to claim 1, characterized in that: The position monitoring device also includes a buffer protection device and a calibration mechanism. The buffer protection device includes a buffer pad fixedly connected to the bottom edge of the lifting platform and a damper disposed at the contact point between the lifting platform and the guide rail system. The calibration mechanism includes a reference calibration block fixedly connected to the top of the base and an adjustment scale disposed on the side wall of the lifting platform.

6. The civil engineering lifting device according to claim 1, characterized in that: The feedback adjustment device includes a signal processor, a comparator, and a control unit. The input terminal of the signal processor is connected to the position monitoring device. The comparator is used to compare the target position signal with the actual position signal and output a deviation signal. The control unit calculates the adjustment command based on the deviation signal and outputs it to the drive mechanism of the fine-tuning device.

7. The civil engineering lifting device according to claim 1, characterized in that: The guide rail system includes a main guide rail fixedly connected to both sides of the base and an auxiliary guide rail disposed between the main guide rails, the main guide rails and the auxiliary guide rails forming a triangular stable structure.

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